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Finding the Fourth Proportional to 979.02, 1,350.81 and 723.60

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Solution

The fourth proportional to 979.02, 1,350.81 and 723.60 is: 998.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.02 : 1,350.81 = 723.60 : x
  2. Step 2: Convert to fraction form
    979.02/1,350.81 = 723.60/x
  3. Step 3: Cross multiply
    979.02x = 1,350.81 × 723.60
  4. Step 4: Simplify right side
    979.02x = 977,446.12
  5. Step 5: Solve for x
    x = 977,446.12/979.02
  6. Step 6: Final answer
    x = 998.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.